You can simply use the startmining command to start mining. The default concensus is PoW.
$ ./mvs-cli startmining account_name password
Optionally, you can use setminingaccount in order to choose which address will be used to mine, and optionally add a MST to be mined (see the section MST mining). These options should be set before starting mining.
$ ./mvs-cli setminingaccount account_name password payment_address -s mst_to_mine
To stop mininig, use the stopmining command without any parameter.
$ ./mvs-cli stopmining